/Engine/Source/Runtime/CoreUObject/Public/Internationalization/PackageLocalizationUtil.h
Given a package path, get the localized root package for the given culture (eg, if given "/Game/MyFolder/MyAsset" and a culture of "fr", this would return "/Game/L10N/fr")
True if the conversion happened, false otherwise
static bool GetLocalizedRoot ( const [FString](API\Runtime\Core\Containers\FString) & InPath, const [FString](API\Runtime\Core\Containers\FString) & InCulture, [FString](API\Runtime\Core\Containers\FString) & OutLocalized )